package containers;

//: containers/SpringDetector.java
// What will the weather be?
import static net.mindview.util.Print.print;

import java.lang.reflect.Constructor;
import java.util.HashMap;
import java.util.Map;

public class SpringDetector {
	// Uses a Groundhog or class derived from Groundhog:
	public static <T extends Groundhog> void detectSpring(Class<T> type) throws Exception {
		Constructor<T> ghog = type.getConstructor(int.class);
		Map<Groundhog, Prediction> map = new HashMap<Groundhog, Prediction>();

		for (int i = 0; i < 10; i++) {
			map.put(ghog.newInstance(i), new Prediction());
		}

		print("map = " + map);
		Groundhog gh = ghog.newInstance(3);
		print("Looking up prediction for " + gh);

		if (map.containsKey(gh)) {
			print(map.get(gh));
		} else {
			print("Key not found: " + gh);
		}
	}

	public static void main(String[] args) throws Exception {
		detectSpring(Groundhog.class);
	}
} /* Output:
map = {Groundhog #3=Early Spring!, Groundhog #7=Early Spring!, Groundhog #5=Early Spring!, Groundhog #9=Six more weeks of Winter!, Groundhog #8=Six more weeks of Winter!, Groundhog #0=Six more weeks of Winter!, Groundhog #6=Early Spring!, Groundhog #4=Six more weeks of Winter!, Groundhog #1=Six more weeks of Winter!, Groundhog #2=Early Spring!}
Looking up prediction for Groundhog #3
Key not found: Groundhog #3
*///:~
